Introduction

The 3ESPDC is a 60-second triaxial weak motion seismometer with an integrated CMG-CD24 digitizer. The compact size and moderate weight (8.3kg) makes it more portable than the the 3T or 3TD. The 3ESPDC has mass locking, unlocking and centering. Data can be directly downloaded from the instrument to an external hard drive via a firewire cable with a waterproof milspec connector. This can be performed whilst the instrument is buried.

The ESPDC has a new type of transfer function which creates high clip levels at high frequencies and a low noise floor at long periods, allowing one to use the dynamic range of the instrument more effectively. This type of instrument is most suitable for the study of body waves and shorter period surface waves.

Much of the information presented in this page is from Guralp.

Specification

Shipping information

ESPDs ship in boxes containing 1 instrument, 1 GPS external antenna and all associated cables

Most projects use one or two 20W solar panels per instrument, details of which can be found here. 12v batteries (usually car batteries) should be provided by the user.

SEIS-UK is able to offer advice on the appropriate number of solar panels and batteries necessary for your period and latitude of deployment.